491961118 has 8 divisors (see below), whose sum is σ = 805027320. Its totient is φ = 223618680.

The previous prime is 491961097. The next prime is 491961137. The reversal of 491961118 is 811169194.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11180913 + ... + 11180956.

It is an arithmetic number, because the mean of its divisors is an integer number (100628415).

Almost surely, 2^491961118 is an apocalyptic number.

491961118 is a deficient number, since it is larger than the sum of its proper divisors (313066202).

491961118 is a wasteful number, since it uses less digits than its factorization.

491961118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22361882.

The product of its digits is 15552, while the sum is 40.

The square root of 491961118 is about 22180.1965275333. The cubic root of 491961118 is about 789.4238805512.

The spelling of 491961118 in words is "four hundred ninety-one million, nine hundred sixty-one thousand, one hundred eighteen".